Finding the Fourth Proportional to 2,985.25, 4,478.86 and 905.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,985.25 : 4,478.86 = 905.33 : x
2. Step 2: Convert to fraction form
   2,985.25/4,478.86 = 905.33/x
3. Step 3: Cross multiply
   2,985.25x = 4,478.86 × 905.33
4. Step 4: Simplify right side
   2,985.25x = 4,054,846.32
5. Step 5: Solve for x
   x = 4,054,846.32/2,985.25
6. Step 6: Final answer
   x = 1,358.29